An unusual trophic subsidy and species dominance in a tropical stream

Jill Lancaster, Michael Dobson, Adiel M Magana, Amanda Arnold, Jude Mathooko

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12 Citations (Scopus)

Abstract

In classical theory, species are assumed to achieve dominance through competitive exclusion, but if food resources are limiting, cross-habitat trophic subsidies could also underpin dominance. The impact of dominant species on community dynamics may depend on the energy base of population size. We report on an unusual, spatially subsidized population of a tropical, stream-dwelling crab that dominates the benthic fauna of a Kenyan stream. Diet and stable isotope analyses indicated that this crab is a true omnivore, with terrestrial subsidies dominating both plant and animal resources.
Original languageEnglish
Pages (from-to)2325 - 2334
Number of pages9
JournalEcology
Volume89
Issue number8
Publication statusPublished - 2008
Externally publishedYes

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